Mastodawn

The APL programming language source code (2012)

https://computerhistory.org/blog/the-apl-programming-language-source-code/

The APL Programming Language Source Code

Thousands of programming languages were invented in the first 50 years of the age of computing. Many of them were similar, and many followed a traditional, evolutionary path from their predecessors. What eventually became APL was first a mathematical notation, not as a computer programming language.

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flint

I went out to talk with a guy, back in about 1995, in Chicago, fired up APL on his notebook, loaded the JPMorgan Risk Metrics data set, fiddled a bit, and reduced the thing to a one-line formula in an interactive window - like a Jupyter Notebook.